Details

The Geissele Super Modular Rail MK4 is the lightweight variant of the Super Modular Rail. The MK4 is a modular, free-floating rail system designed to fit all mil-spec AR-15 rifles. Rather than having four sharp continuous M1913 rails, the MK4 features one continuous M1913 rail along the top, while the 9, 3, and 6 o'clock positions the M1913 rail is abbreviated and is only present at the muzzle end for weight reduction. Machined from aircraft grade aluminum, the MK4 is designed to meet the most vigorous of military and civilian applications while still remaining lightweight and rigid. 13" Black Finish.